Tear Deformation Time and optical quality in eyes wearing silicone hydrogel contact lenses

Amir Asharlous; Ebrahim Jafarzadehpur; Ali Mirzajani; Mehdi Khabazkhoob; Samira Heydarian; Ali Taghipour

doi:10.1016/j.joco.2016.07.002

Tear Deformation Time and optical quality in eyes wearing silicone hydrogel contact lenses

J Curr Ophthalmol. 2016 Jul 25;28(4):226-227. doi: 10.1016/j.joco.2016.07.002. eCollection 2016 Dec.

Authors

Amir Asharlous¹, Ebrahim Jafarzadehpur², Ali Mirzajani³, Mehdi Khabazkhoob⁴, Samira Heydarian⁵, Ali Taghipour⁶

Affiliations

¹ Optometry Department, Mashhad University of Medical Sciences, Mashhad, Iran; Optometry Department, Iran University of Medical Sciences, Tehran, Iran.
² Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran.
³ Optometry Department, Iran University of Medical Sciences, Tehran, Iran.
⁴ Department of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
⁵ Department of Optometry, School of Paramedical Science, Mashhad University of Medical Science, Mashhad, Iran.
⁶ Department of Epidemiology & Research Methodology, Faculty of Health, Mashhad University of Medical Sciences, Mashhad, Iran.

Abstract

Purpose: To evaluate tear film stability and optical aberrations in eyes wearing plano Lotrafilcon B contact lenses (CL).

Methods: Tear Deformation Time (TDT) and aberrometric parameters were assessed in 86 normal emmetropic eyes before and 6 h after wearing CL.

Result: A statistically significant decrease in TDT and increase in root mean square (RMS) values of higher order aberrations (HOA) were revealed 6 h after CL insertion (both P < 0.001). The low order aberrations (LOA) RMS values measured with CL were higher than those in naked eyes, but the difference was not statistically significant. None of individual Zernike polynomials showed any significant alteration.

Conclusion: Our findings indicated that the Lotrafilcon B contact lens affects HOA more than LOA. The tear film was less stable after wearing CL.

Keywords: Aberrations; Optical quality; Silicone hydrogel contact lens; Tear Deformation Time; Tear stability.